names of bright & dark fornights of a month in Hindu Calendar

Here are the names of the days (15 days) around the waxing and waning of the moon. This is as per Hindu Lunar Calendar.

1. Pratipada - 1st day of lunar fortnight
2. Dvitiya - 2nd day
3. Tritiya - 3rd day
4. Chaturthi - 4th day
5. Panchami - 5th day
6. Shasthi - 6th day
7. Saptami - 7th day
8. Ashthami - 8th day
9. Navami - 9th day
10. Dashami - 10th day
11. Ekadashi - 11th day
12. Dvadashi - 12th day
13. Triyodashi - 13th day
14. Chaturdashi - 14th day
15. Purnima - 15th day (Full moon day)
    
16. Amavasya - 16th day (no visible moon in the night sky)

(Source: Pg 10, Fasts and Festivals of India, Manish Verma, Diamond Pocket books)